Hi,
sorry to bother you here. I was looking for your contact on your website, but there is none.
Anyway, I found your project very interesting. In fact, I have one SBM-20 Geiger tube (I planned to build my own Geiger counter a few years ago, but never finished it). What is the difference between this and your STS-5 tube?
Also, where did you find metallic holders for lamps? Do you have a figure (picture of a prototype) of the circuit and list of required materials?
And the final question - did you plan to make a digital Geiger counter based on Raspberry Pi?
P. S. My e-mail can be found here: https://keyserver.ubuntu.com/pks/lookup?op=get&search=0xBEA5286DA9CF4A88
Regards,
M.